Sunflowers move from east to west, and back, by the clock

When they're mature, sunflowers stop tracking the sun and instead face solely eastward.

It’s summertime, and the fields of Yolo County, Calif., are filled with rows of sunflowers, dutifully facing the rising sun.

 

At the nearby University of California, Davis, plant biologists have now discovered how sunflowers use their internal circadian “clocks,” acting on growth hormones, to follow the sun during the day as they grow.

 

“It’s the first example of a plant’s clock modulating growth in a natural environment, and having real repercussions for the plant,” said …

More at http://www.nsf.gov/news/news_summ.jsp?cntn_id=139271&WT.mc_id=USNSF_52&WT.mc_ev=click

 

This is an NSF News – Biology item.

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